import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import Stats from 'three/addons/libs/stats.module.js';

import { PLYLoader } from 'three/addons/loaders/PLYLoader.js';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {	

  let container, stats;

  let camera, scene, renderer;

  let mouseX = 0, mouseY = 0;

  let windowHalfX = window.innerWidth / 2;
  let windowHalfY = window.innerHeight / 2;

  init();
  animate();

  function init() {

    container = document.createElement( 'div' );
    document.body.appendChild( container );

    camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 100000 );
    camera.position.z = - 4000;

    //

    const r = 'textures/cube/Park3Med/';

    const urls = [
      r + 'px.jpg', r + 'nx.jpg',
      r + 'py.jpg', r + 'ny.jpg',
      r + 'pz.jpg', r + 'nz.jpg'
    ];

    const textureCube = new THREE.CubeTextureLoader().load( urls );
    textureCube.mapping = THREE.CubeRefractionMapping;

    scene = new THREE.Scene();
    scene.background = textureCube;

    // LIGHTS

    const ambient = new THREE.AmbientLight( 0xffffff, 3.5 );
    scene.add( ambient );

    // material samples

    const cubeMaterial3 = new THREE.MeshPhongMaterial( { color: 0xccddff, envMap: textureCube, refractionRatio: 0.98, reflectivity: 0.9 } );
    const cubeMaterial2 = new THREE.MeshPhongMaterial( { color: 0xccfffd, envMap: textureCube, refractionRatio: 0.985 } );
    const cubeMaterial1 = new THREE.MeshPhongMaterial( { color: 0xffffff, envMap: textureCube, refractionRatio: 0.98 } );

    //

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    container.appendChild( renderer.domElement );

    stats = new Stats();
    container.appendChild( stats.dom );

    const loader = new PLYLoader();
    loader.load( 'models/ply/binary/Lucy100k.ply', function ( geometry ) {

      createScene( geometry, cubeMaterial1, cubeMaterial2, cubeMaterial3 );

    } );

    document.addEventListener( 'mousemove', onDocumentMouseMove );

    //

    window.addEventListener( 'resize', onWindowResize );

  }

  function onWindowResize() {

    windowHalfX = window.innerWidth / 2;
    windowHalfY = window.innerHeight / 2;

    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

  }

  function createScene( geometry, m1, m2, m3 ) {

    geometry.computeVertexNormals();

    const s = 1.5;

    let mesh = new THREE.Mesh( geometry, m1 );
    mesh.scale.x = mesh.scale.y = mesh.scale.z = s;
    scene.add( mesh );

    mesh = new THREE.Mesh( geometry, m2 );
    mesh.position.x = - 1500;
    mesh.scale.x = mesh.scale.y = mesh.scale.z = s;
    scene.add( mesh );

    mesh = new THREE.Mesh( geometry, m3 );
    mesh.position.x = 1500;
    mesh.scale.x = mesh.scale.y = mesh.scale.z = s;
    scene.add( mesh );

  }

  function onDocumentMouseMove( event ) {

    mouseX = ( event.clientX - windowHalfX ) * 4;
    mouseY = ( event.clientY - windowHalfY ) * 4;

  }

  //

  function animate() {

    requestId = requestAnimationFrame( animate );

    render();
    stats.update();

  }

  function render() {

    camera.position.x += ( mouseX - camera.position.x ) * .05;
    camera.position.y += ( - mouseY - camera.position.y ) * .05;

    camera.lookAt( scene.position );

    renderer.render( scene, camera );

  }
  }
})